Years ago, the Locust Horde gathered under every major city and launched a surprise attack. Untold numbers died on Emergence Day, and rather than allow the Locust to keep the spoils of their aggression, humans used chemical weapons and orbital particle beams to destroy them - and their own cities.
With most urban centers and military installations rubble, survivors gathered on Jacinto Plateau, whose solid granite strata could not be easily penetrated. When the Horde breached the plateau's defenses, Marcus Fenix defied orders to save his father at East Barricade Academy - but he was too late. Charged with dereliction of duty, he has been sentenced to 40 years in Jacinto Maximum Security Penitentiary...

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I took inspiration from the Survival Horror genre and tried to tie it in with Gears of War gameplay. The end result is a haunted mansion style setting with enemies popping out of every corner. This level makes use of custom prefabs, sound effects, particles, and textures.
Marcus Fenix and Dominic Santiago were sent to investigate signs of Locus activity in a previously dormant part of the city. As they stormed the entrance of the abandoned mansion, they set off an improvised booby trap. The resulting explosion left Marcus unconscious and Dominic badly injured. When Marcus comes to, he realizes his weapons are gone, and so is Dom.
Mission Briefing:
Upon waking up, you realize you are all alone, and unarmed. The explosion has blocked off the entrance, and the only way back home is to find a way out. Your immediate concern is to survive until you can find a weapon. Your overall mission is to rescue Dom, and find an alternate exit for extraction.

Not sure what the problem could be. The tilde key is usually bound to the console. Some versions of UT use Tab as the console button. Perhaps try that one? Are you pressing the tilde key at the menu screen?